package com.qymerge.manage.core.utils;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

/**
 * Desc POI生成excel
 * User licong
 * Date 2015/11/24
 * Time 11:28
 */
public class ExportExcelUtil<T> {

    /**
     *
     * @param headers
     *            标题行
     * @param dataset
     *            数据集合
     * @param out
     */
    public void exportExcel(String title, String sheetName, String[] headers, Collection<T> dataset, OutputStream out) {
        exportExcel(title, sheetName, headers, dataset, out, "yyyy-MM-dd");
    }

    /**
     * 表格标题默认样式
     * @param workbook
     * @return
     */
    public HSSFCellStyle titleStyle(HSSFWorkbook workbook) {
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFillForegroundColor(HSSFColor.WHITE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        HSSFFont font = workbook.createFont();
        font.setFontHeightInPoints((short) 14);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        style.setFont(font);
        return style;
    }

    /**
     * 表格表头默认样式
     * @param workbook
     * @return
     */
    public HSSFCellStyle headStyle(HSSFWorkbook workbook) {
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFillForegroundColor(HSSFColor.GREEN.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        HSSFFont font = workbook.createFont();
        font.setFontHeightInPoints((short) 12);
        font.setColor(HSSFColor.WHITE.index);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        style.setFont(font);
        return style;
    }

    /**
     * 表格表体默认样式
     * @param workbook
     * @return
     */
    public HSSFCellStyle bodyStyle(HSSFWorkbook workbook) {
        HSSFCellStyle style = workbook.createCellStyle();
        // style.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
        style.setFillForegroundColor(HSSFColor.WHITE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        HSSFFont font = workbook.createFont();
        font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        style.setFont(font);
        return style;
    }

    /**
     * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
     *
     * @param title
     *            表格sheet名称
     * @param headers
     *            表格属性列名数组
     * @param dataset
     *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
     *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
     * @param out
     *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
     * @param pattern
     *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
     */
    @SuppressWarnings({ "unchecked", "deprecation" })
    public void exportExcel(String title, String sheetName, String[] headers, Collection<T> dataset, OutputStream out, String pattern) {
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet(sheetName);
        // 设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth((short) 20);
        // 声明一个画图的顶级管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        // HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
        // 0, 0, 0, (short) 4, 2, (short) 6, 5));
        // 设置注释内容
        // comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
        // comment.setAuthor("leno");

        // 产生表格标题行
        int index = 0;
        HSSFRow row = sheet.createRow(index);
        row.setHeightInPoints(15);
        if (title != null) {
            HSSFCell cell = row.createCell(0);
            cell.setCellStyle(titleStyle(workbook));
            cell.setCellValue(title);
            sheet.addMergedRegion(new CellRangeAddress(0, (short) 0, 0,(short) headers.length - 1));
            row = sheet.createRow(++index);
            row.setHeightInPoints(30);
        }
        for (short i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(headStyle(workbook));
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }

        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            row.setHeightInPoints(15);
            T t = (T) it.next();
            // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
            Field[] fields = t.getClass().getDeclaredFields();
            for (short i = 0; i < fields.length; i++) {
                HSSFCell cell = row.createCell(i);
                //cell.setCellStyle(bodyStyle(workbook));
                Field field = fields[i];
                String fieldName = field.getName();
                String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

                try {
                    Class tCls = t.getClass();
                    Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
                    Object value = getMethod.invoke(t, new Object[] {});
                    // 判断值的类型后进行强制类型转换
                    String textValue = null;
                    if (value == null) {
                        textValue = "";
                    } else if (value instanceof Date) {
                        Date date = (Date) value;
                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                        textValue = sdf.format(date);
                    } else if (value instanceof byte[]) {
                        // 有图片时，设置行高为60px;
                        row.setHeightInPoints(60);
                        // 设置图片所在列宽度为80px,注意这里单位的一个换算
                        sheet.setColumnWidth(i, (short) (35.7 * 80));
                        // sheet.autoSizeColumn(i);
                        byte[] bsValue = (byte[]) value;
                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,1023, 255, (short) 6, index, (short) 6, index);
                        anchor.setAnchorType(2);
                        patriarch.createPicture(anchor, workbook.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                    } else if (fieldName.contains("time") && value instanceof Long) {
                        long time = (Long) value;
                        if (time > 0) {
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                            textValue = sdf.format(new Date(time));
                        }
                    } else if (fieldName.contains("_count") && value instanceof Long) {
                        long count = Long.valueOf(value.toString());
                        if (-1 == count) {
                            textValue = "-";
                        } else {
                            textValue = value.toString();
                        }
                    } else {
                        // 其它数据类型都当作字符串简单处理
                        textValue = value.toString();
                    }
                    // 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
                    if (textValue != null && !"".equals(textValue)) {
                        /*if (textValue.matches("^\\d+(\\.\\d+)?$")) {
                            // 是数字当作double处理
                            cell.setCellValue(Double.parseDouble(textValue));
                        } else {
                            HSSFRichTextString richString = new HSSFRichTextString(
                                    textValue);
                            cell.setCellValue(richString);
                        }*/
                        cell.setCellValue(textValue);
                    }
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } finally {
                    // 清理资源
                }
            }
        }
        try {
            if (workbook != null) {
                workbook.write(out);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
